Geez, no wonder I loved this movie.

Butler = George
Diane = Maria

Butler = Scientist
George = Scientist

Queen Mary = Ethereal with blonde hair and carnival-like palace.
Diane = Beautiful with blonde hair and carnival big-top.

Magicant = Pillars
Faunz = Pillars

Guy who went psychotic and lost what he loved: Butler
Guy who went psychotic and lost what he loved: George

Just like a pup: Giegue
Just like a pup: Jirachi

Meteorite/Onyx Stone: Giegue/George's Melody aka Gravestone
Meteorite/Onyx Stone: Jirachi

Powered by Machine: Giegue
Powered by Machine: Jirachi (being part-Steel)

Electricity to Save the World: EVE
Electricity to Save the World: Reversing the weird machine thingee to suck back Demon*Groudon with Jirachi's help

INVINCIBLE JUGGERNAUT: Giegue
INVINCIBLE JUGGERNAUT: Demon*Groudon, powered by an unwilling Jirachi

MACHINE OF DOOM (Until PWN'D By Sacrifice): R7308XX
MACHINE OF DOOM (Until PWN'D By Sacrifice): Demon*Groudon

PWN'D by Melody: Giegue
PWN'D by Melody: Jirachi (in this case, Jirachi likes it and wanted to hear it before going back to sleep)

Take a Melody, Simple As Can Be: 8 Melodies
Take a Melody, Simple As Can Be: Chiisaki Mono (Small One)/Make a Wish